646516 has 12 divisors (see below), whose sum is σ = 1218532. Its totient is φ = 298368.

The previous prime is 646453. The next prime is 646519. The reversal of 646516 is 615646.

It can be written as a sum of positive squares in 2 ways, for example, as 90000 + 556516 = 300^2 + 746^2 .

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6165 + ... + 6268.

2⁶⁴⁶⁵¹⁶ is an apocalyptic number.

It is an amenable number.

646516 is a deficient number, since it is larger than the sum of its proper divisors (572016).

646516 is a wasteful number, since it uses less digits than its factorization.

646516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12450 (or 12448 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 646516 is about 804.0621866498. The cubic root of 646516 is about 86.4688651353.

It can be divided in two parts, 646 and 516, that multiplied together give a triangular number (333336 = T₈₁₆).

The spelling of 646516 in words is "six hundred forty-six thousand, five hundred sixteen".